Fix thinlinc client downloader

The download page without trailing slash now redirects to trailing
slash, and the page also contains the link to the .rpm twice.

files/add_latest_thinlinc_client_to_repos

@@ -6,13 +6,15 @@ cleanup() {
 }
 trap cleanup 0
 
+set -o pipefail
+
 ensure_client_downloaded() {
     local url="$1" filename="$2"
     [ -f "$filename" ] && return
     curl --silent --show-error -o "${WORKDIR}/${filename}" "$url"
 }
 
-if ! latest_client_url="https://www.cendio.com$(curl --silent --show-error https://www.cendio.com/thinlinc/download | grep -Eo '/downloads/clients/thinlinc-client-[^"]+.x86_64.rpm')"; then
+if ! latest_client_url="https://www.cendio.com$(curl -L --silent --show-error https://www.cendio.com/thinlinc/download/ | grep -Eo '/downloads/clients/thinlinc-client-[^"]+.x86_64.rpm')" | head -1; then
     exit 1
 fi